Japan Flora: Rhizomes short; culms tufted, 15-40 cm. long, acutely angled, scabrous above, slender, firm; the blades 2-3 mm. wide; in­florescence dense, short-cylindric, 2-5 cm. long, nearly bractless, the spikes numerous, usually androgynous, sometimes nearly unisexual, oval, 5-8 mm. long; pistillate scales narrowly ovate, membranous, brownish ferrugineous, acute; perigynia slightly longer than the scales, 3-3.5 mm. long, narrowly ovate, faintly nerved, planoconvex, gradually long-beaked, the sharp margins usually nearly smooth, sometimes very slighdy scabrous near the minutely 2-toothed apex; achenes small, about 1.2 mm. long, nearly orbicular, biconvex; style dender, brown, bifid. May.

Honshu (Bitchu, Settsu); rare. Korea and Ussuri.